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Authors
Paananen, Reija https://orcid.org/0000-0002-9492-8461
Tuulio-Henriksson, Annamari
Merikukka, Marko
Gissler, Mika
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Article History
Received: 26 June 2019
Accepted: 30 March 2020
First Online: 8 April 2020
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study obtained ethics approval of the Ethical committee at the Finnish Institute for Health and Welfare ยง28/2009 and have therefore been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.
